Q18 of 33 Page 22

Illustrate an activity to show a double displacement reaction. Give the chemical equation of the reaction that takes place.

Double displacement reaction is a type of reaction which involves the exchange of ions.

Example of Double Displacement Reaction:


Mix ferrous sulphate solution with sodium hydroxide solution. The reaction gives a dirty green precipitate of ferrous hydroxide. The reaction is as follows:



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16

What is a redox reaction? Identify the substance oxidized and the substance reduced in the following reactions.

a. Pb3O4 + 8HCl → 3PbCl2 + Cl2 + 4H2O


b. CuO + H2→ Cu + H2O

 17

Identify the type of each of the following reactions:

a. A reaction in which a single product is formed from two or more reactants.


b. The reaction mixture becomes warm.


c. An insoluble substance is formed.

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Why aluminium sheets do not corrode easily? Why does a copper vessel get covered with a green coating in rainy season?

 20

Observe the diagram given alongside and answer the following questions:


a. What do you observe when lead nitrate is heated?


b. Mention the two gases evolved equation for it.


c. Write the balanced chemical equation for it.


d. What is the type of chemical reaction called?


e. Give one more example of this type of reaction.